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Other Intangible Assets, Net
 6 Months Ended
Jun. 30, 2011
Other Intangible Assets, Net [Abstract]  
Other Intangible Assets, Net
Note 9. Other Intangible Assets, Net
The gross carrying amount of intangible assets and the related accumulated amortization for intangible assets subject to amortization are as follows:
                                         
            June 30, 2011     December 31, 2010  
    Weighted Average Life     Gross Carrying     Accumulated     Gross Carrying     Accumulated  
Amortizable Intangible Assets   (Years)     Amount     Amortization     Amount     Amortization  
Patents
    15     $ 2,115,624     $ (330,115 )   $ 1,861,684     $ (266,228 )
Amortization expense for the three months ended June 30, 2011 and 2010 was approximately $33,000 and $25,000, respectively. Amortization expense for the six months ended June 30, 2011 and 2010 was approximately $64,000 and $48,000, respectively.